Armchair



FIG. 1 is a front perspective view of an armchair showing my design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a left side elevational view thereof, the right side elevational view being a mirror image thereof. 

The ornamental design for an armchair, as shown and described. 